Improvement in padlocks



B. WAL LMAN N.

Pad-Lock` FIG. l0.

Patented Oct. 26,1875..

UNITED STATES PATENT EEICEa BODO WALLMANN, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN PADLOCKS.

Specification forming part of Letters Patent No. 169,211, dated October26, 1875; application filed August 31, 1875. l

To all lLoh-0m t't may concern:

Be it known that I, BODO WALLMANN, of the city and county ot' SanFrancisco, State of California, have invented Improvements in Padlocks,of which the following is a specilication:

My invention in padlocks consists essentially in arranging the workingparts so that the bolt shall be in direct communication with the dog bymeans of a connecting spi-ral spring,

` whereby the same may be actuated by an ordinary plate-key, follower,hasp, and tumblers, in such manner that this connecting spiral springshall be always contracted or at rest in the normal state of the lock,but shall be at its fullest tension at the points of locking andunlocking, and shall exert such force in a direct line; the object of myinvention being to construct by this device a strong, simple, cheap,secure, and durable lock, as hereinafter described.

Figure l is a front view or vertical longitudinal elevation of thepadlock embodying my invention, wherein it is shown with the plate ofthe casing removed. Fig. 2 is a vertical transverse section of Fig. lthrough the line a: Fig. 3 is a vertical longitudinal elevation of thispadlock with tumblers and front plate removed, showing the haspdisengaged from the bolt. Figs. et, 5, and 6 are an end plan and sideview, respectively, of the dogpiece. Figs. 7, 8, and 9 are an end planand side view, respectively, of the bolt. Fig. 10 is a side View of thekey. A

With reference to the drawing, C is an ordinary metallic padlock-casing,provided with xed pins f f f, for the fitting thereto of acovering-plate, P, and also a pin, g, and teats h and i, for receiving ahasp, H, dog D, and set of tumblers T T T, respectively,.while theremaining parts, consisting of a bolt, B, and connecting spiral springS, form'with this dog D, in their construction and arrangement, theessential features of this my improvement. The dog D is adjusted to theteat h, fixed to the casing C, and forming part of a guide, Z, for thebolt B, and differs from the general form of such movable lockpieces inbeing provided, in addition to the ear r, with two arms, one, a,carrying a pin, b, for the attachment thereto of a spiral spring, S, andthe other, c, for use both as a slide-bit and stop to the bolt B. Thisbolt B is provided at its shank end' with a projecting pin, p, for the4connection thereto of this spiral spring S from the arm a of the dog D,and, when actuated backward or forward, is made to slide between theupper casing-plate k and the lower guides and G. At about the middle ofthe lower part of this bolt B it projects downward into the shape of adeep flange-piece, F, wherein a groove, m, is'so arranged as to admit of-the slide-stop c therein during the travel of, or forward movementof,the bolt. This ange F is also hollowed out in the shape of an arc on oneside, so as to allow of the travel of this stop c against it when thedog D is being turned on the xed teat h, and it serves to hold the boltB stationary. Also, a lug, o, is fixed onto the dan ge F of the bolt, sothat an ordinary set ot" tumblers, T T' T, with actuating-springs c c o,respectively, properlywarded key K, and follower E, may cause this lug oto enter the slots y y y of these tumblers when the bolt B is beingpushed back by this key K.

The operation of this lock is as follows: Supposing the hasp H to besecured by the bolt B in the usual manner, and it -is required torelease the same or unlock, the key K is inserted into the follower Eand turned from left to right, so as to press against the lower part ofthe flange-piece F. This will move the bolt B backward between theguides k, l, and G, and cause the lug o to enter the slots y y y of thetumblers T T T", while the dog D is kept stationary by reason ofthegrooved part m ot' the bolt holding in place the slidestop c during itstravel, but as this bolt keeps on receding it necessarily will elongatethe spiral spring S and increase its tension till such time as thegroove m releases the stop c, when, the bolt being freed at the sameinstant from the hasp H, the full force of this spring will be exertedin bringing up the dog-'ear 1' and throwing well outward the hasp H,thus unlocking the padlock. For reversing the operation, or locking, thehasp H is pressed downward, in the usual manner, onto this ear by reasonof the dog D being made to turn on its fixed pin h, and in so doing thespring S becomes again elongated by the receding of the pin b from thebolt-shank pin p, (as the bolt B is prevented from moving by the actionof the stop 0,) but when this stop c has arrived in line soas tocoincide with the groove m .the spring S, having attained the requisitetension, shoots forward the now unobstructed bolt in the direction ofthis extended spring, and consequently with its full force, so that thelocking is instantly effected.

By this arrangement a strong, simple, and cheap lock is obtained, since,independently of the usual hasp, key, follower, and tumblers,

the Working portions are restricted to a bolt,

dog, and connecting spiral spring. It is also 4 essentially a durablelock, for, as already explained, by reason of the spiral spring S o'nlybeing extended when actually required for use, it is not subjected tothe wear and tear of other locks, wherein the springs are continually attension, and, as this 'spring is spiral, and acts directly in line withthe bolt, it has considerable advantage over those having a curved orcircular movement. It is, besides, a safe or secure lock when comparedto those with Ordin ary springs, inasmuch as a lock with a curved springcan readily be tampered with `by a blow from a lnallet on the side ofthe padlock-casing, which instantly disorganizes the spring and severalpieces within, while in this device the various parts would have to bebroken by such hammering before releasing the hasp.

I claim as my invention- 1. The spiral spring S, connecting the dog D byits arm a, and pin b to the bolt B by the shank-pin p, arranged so as toactuate the bolt B longitudinally between the. guides l, G,

